<!DOCTYPE html>
<html lang="zh-CN">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    p {
      /*
        font: style weight size/line-height family;
         ● style weight 和 line-height 可以省略
         ● size 和 family 不能省略
       */
      font: italic bold 16px/3 宋体, sans-serif;
    }
  </style>
</head>

<body>
  <p>Hello world!</p>
</body>

</html>